NÚMERO 36
VOLUMEN 6
JUNIO 1971

ON THE AGES OF THE GALACTIC CLUSTERS NGC 188,
M 67 AND NGC 6791
Silvia Torres-Peimbert

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3


AGES AND MASSES FOR NINE "SUPER-METAL-RICH"
FIELD STARS
Silvia Torres-Peimbert and Hyron Spinrad

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15


PLANETARY NEBULAE. I. PHOTOELECTRIC PHOTOMETRY
Manuel Peimbert and Silvia Torres-Peimbert

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21


PLANETARY NEBULAE. II. ELECTRON TEMPERATURES
AND ELECTRON DENSITIES
Manuel Peimbert

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29


THE DEPENDENCE OF PHYSICAL PROPERTIES OF FLARE-UPS
ON THE ABSOLUTE LUMINOSITY OF UV Ceti STARS
G. A. Gurzadyan

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39


COMPARATIVE STUDY OF RADIO AND OPTICAL PHOTOMETRY
OF SEVERAL HII REGIONS. II.
E. F. Schmitter and E. Recillas-Cruz

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47


A FINDING LIST OF STARS OF SPECTRAL TYPE A5 AND
EARLIER IN REGIONS AT HIGH GALACTIC LATITUDES.
V. I. HLF 3
A. G. Davis Philip and Lawrence J. Relyea

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69


INTERMEDIATE BAND PHOTOMETRY OD THE SCORPIO-CENTAURUS
ASSOCIATION AND SOUTHERN BRIGHT STARS
Eugenio E. Mendoza V.

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73


INTERMEDIATE BAND PHOTOMETRY OF V Puppis
Eugenio E. Mendoza V.

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89


PRELIMINARY REPORT ON THE ASTRONOMICAL SITE AT
SAN PEDRO MARTIR, BAJA CALIFORNIA, MÉXICO
Eugenio E. Mendoza V.

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95